Key bolt



June 30, 1931. J. P. NORTHEY ETAL KEY BOLT Filed Feb. 3, 1928 Maw l 7% Fatented June 30, 9 j a Y I v 1,312,21tff JOHN P. NORTHEY AND RoDNEYjv. Nomrrmmon roizon'r 'onmmro, :oANA'nn As- SIGNORS 'ro CONSOLIDATED BOLT" ooMrAnv m-ivrr'rnnor 'ronon 'ro, OANADA KEY ZBQLT Application'filed February -3, "ie2"s. Serial 251590. 1

This invention relates to key bolts of the jFi g. 1.

type disclosed in the United States' Patent to Frederick L; H. Sims No. 15266534, dated May. 14th, 1918, in which the key bolt is di- 5 vided from the innerj'endfof its slotto and through the head. As suchbolts have here.

I joint with the slot inclined to the'rail base soi that the key may be driven without interfer-5 ence from adj oiningbolts. the-plane ofthe division betwen the halves of the bolt is not parallel to the rail base, and pressure of the rail longitudinally of the base therefore comes unevenly against the parts of the bolt and parts.

tends to distort the bolt by displacing the (b) To prevent V thebolt is in use, itis "desirable to havethe key fit the slot tightly,-so that it is frictionally gripped by its sides. As the bolt has heretofore been made, it has been essential to have the slotted portion a loose fit in the angle bar I readily sprung apart to give as good a grip on the sides of the key as is desirable.

(0) As so far made, unless expensivespe-. cially forged; blanks, were employed, the length of the toe ofthebolt could not be made sufficiently great to develop the full tensile strength of the shank of the bolt.

(03) As the bolt'neck has'so far been made, it hasbeenidilficult to give it the desirable tight .fitin the angle bar without making it diflicult to position the bolt in the angle bars andrail. Y

theky backing out when? iwhiclrthe bolt is formed.

' indicate asection on the l-.;*'fF igLa side el'evation of the'blank from 1' In the drawi gsl kenunierals df iiefreiice correspondingparts in'the different round bar steel. This half-round bar is bent line in i i lf g a blank fromi w hich: z er djy If. the finished bolt is t 'bstam *tially'cylindrical; the blankis formed of halfover a mandrel havin g the" form in moss. sec-i *tion of the desired "sl'otf l inthe bolt and the *part sbrou'ght into parallelism.* The partsiat the slotted end ofthe bolt are then rolledor drawn downto'reduee thei'r ic'ro's's sectional area,,lea'ving the metal at its full cro'sssece:

I tionalarea'yvherej the endofthe boltiis inter-1 'sected bythe median plane-ofthe slot. 's'uming' the half-roundblank to havearadius of. the reduction of the partsv between which the slot is formed is carried outuntil theeio,

trerne diameter, including-"the? inch slot,'i's "31 /32 of an -in c-hf with which it is usedso that itinay be'readily positioned. The parts in this case are too iInthe process of forming th1501t, *1; &v ever, 'theparts adjacent the slot are formed li/ei g n "with aslight taperfthe' taper preferably'be ginning. atthe line'ct a,.which is approX-' iniatelythe.positionrot theouter side of the adjacent angle bar of the rail jointin which the bolt is used. The taper is slight, but is i sufiicient' to facilitate the passage of; theend tfit inthe angle bar. when in'pos'ition. This is of. the bolt through thehole in the angle bar.

The bolt may thus. be caused to have a tight "at v of great value, as it is desirable to use, a tight f Y fitting key with the bolt so as to; obtain full-" In the present inventlon it is our ob'ect to advantage of the frictional engagement of i I the sideof the key ith the sides of the slot"; The tight fitting offthe key in the angle bar to resist acoidentalbacking'out of the key.

prevents thespreading ofthe' halves of'the bolfi when the ey s driven and maintains the frictional grip at a maximum. The neck 2 of the bolt is of elliptical form close to the head, bum-instead ofterminating at the :inner side fth-e neck in a more or less abrupt. shoulder, it is tapered down sub- 4 F i'g.3 a section on the line 33 in Fig. 1;

stantially to the cylindrical form of the un slotted shankof the bolt, This facilitatestl e 9 entrance of the neck into the hole in the adjacent angle bar at or about the time the portion of the slotted end of the bolt of greatest diameter is becoming positioned in the opposite angle bar.

As hereinbefore stated, the slot in a direction transverse of the bolt must be inclined upwardly when the bolt is in position in a rail joint. Preferably this inclination is about 15 from the horizontal. At the same time it is preferable that the plane of the division through the shank, neck and head should be substantially horizontal, for reasons hereinbefore referred to, when the bolt is so positioned. I attain this desired arrangement by twisting the bolt approximately midway of its length until the inedian plane of the slot lies at a suitable angle,say 15, to the division 8 between the parts of the unslotted shank of the bolt (see Figs. 1 and 4). The twist is preferably confined to a small part of the length of the bolt in order to ensure that the part of the shank of the bolt which may come into contact with the end of the slot in the web of the rail will engage equally with both parts.

From the aboy e description it will be seen 7 that we have devised a construction of bolt which will satisfactorily attain the objects of our invention as set out in the statement to this specification.

What we claim as our invention is:

A slotted bolt comprising a slotted portion; and a longitudinally divided nonslotted stem in which the plane of division lies at an acute angle to the median plane of the slot, and includes a divided twisted portion forming a connection between the two parts aforesaid and in which the plane of division turns through the acute angle aforesai Signed at Toronto, Canada, this 22nd day of December 1927 JOHN P. NORTHEY. RODNEY V. NORTHEY. 

